Subsequent Events - Additional Information (Detail) - $ / shares	1 Months Ended
	Jan. 25, 2017	Jan. 21, 2016	Jan. 31, 2014
Subsequent Event [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights		1,416,668
Class of Warrant or Right, Exercise Price of Warrants or Rights		$ 1.79	$ 30.40
Subsequent Event | Series E Convertible Preferred Stock [Member]
Subsequent Event [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	1,000,000
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 0.60
Preferred Stock, Redemption Date	Jan. 25, 2017
Preferred Stock Amended Redemption Date	Mar. 08, 2017
Class Of Warrant Or Rights Expiration Term	5 years 6 months
Lock Up Agreement Description	pursuant to which the Series E Stockholders agreed not to sell any common stock obtained upon conversion of the Series E Preferred Stock, until after March 31, 2017, for less than $0.50 per share.
Subsequent Event | Series E Convertible Preferred Stock [Member] | Maximum [Member]
Subsequent Event [Line Items]
Preferred Stock Redemption Price Percentage	170.00%
Subsequent Event | Series E Convertible Preferred Stock [Member] | Minimum [Member]
Subsequent Event [Line Items]
Preferred Stock Redemption Price Percentage	165.00%